ActionDispatcher.js

let _dispatchers = {};
let _clientSocket = null;

export default class ActionDispatcher extends EventEmitter {
  constructor() {
    super();
    
    _dispatchers[this.name || this.constructor.name] = this;
  }
  
  dispatch(action) {
    if (_clientSocket) {
      _clientSocket.emit("_dispatch", {
        sender: this.name || this.constructor.name,
        action: action,
      });
    } else {
      this.emit("dispatch", action);
    }
  }
  
  register(callback) {
    this.on("dispatch", callback);
  }
  
  static setSocket(socket, mode) {
    if (mode === ActionDispatcher.SERVER_MODE) {
      socket.on("_dispatch", ({ sender, action }) => {
        let target = _dispatchers[sender];
        if (target) {
          target.emit("dispatch", action);
        }
      });
    }
    if (mode === ActionDispatcher.CLIENT_MODE) {
      _clientSocket = socket;
    }
  }
}

ActionDispatcher.SERVER_MODE = "server";
ActionDispatcher.CLIENT_MODE = "client";

actions-SampleActions.js

import ActionDispatcher from "../ActionDispatcher";

export class SampleActions extends ActionDispatcher {
  bang() {
    this.dispatch({
      actionType: "bang",
    });
  }
  
  hello(name) {
    this.dispatch({
      actionType: "hello",
      text: `hello! ${name}`,
    });
  }
}

export default new SampleActions();

client.js

import SampleActions from "./actions/SampleActions";
import ActionDispatcher from "./ActionDispatcher";

let socket = window.io();

ActionDispatcher.setSocket(socket, ActionDispatcher.CLIENT_MODE);

server.js

import SampleActions from "./actions/SampleActions";
import ActionDispatcher from "./ActionDispatcher";

socketIO.on("connecting", (socket) => {
  ActionDispatcher.setSocket(socket, ActionDispatcher.SERVER_MODE);
});

simulator.js

import SampleActions from "./actions/SampleActions";
import ActionDispatcher from "./ActionDispatcher";
import EventEmitter from "./EventEmitter";

let socket = new EventEmitter();

ActionDispatcher.setSocket(socket, ActionDispatcher.SERVER_MODE);
ActionDispatcher.setSocket(socket, ActionDispatcher.CLIENT_MODE);